|Quadrangle map, 1:250,000-scale||MH|
|Quadrangle map, 1:63,360-scale||A-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The CC Barite occurrence is located at an elevation of about 5,600 feet, 0.2 mile north-northwest of peak 6835 and 0.8 mile west-northwest of peak 6740 in the NW1/4 section 34, T. 17 N., R. 7 E., Copper River Meridian. The location is accurate.|
The CC Barite occurrence is in an exposure of the Drum unit; bedded barite is enclosed in quartz-sericite schist that contains sparse disseminated galena and chalcopyrite. This is the only occurrence of bedded barite that has been identified in the Delta mineral belt; it may represent an exhalative precipitate that accumulated peripheral to or capping a sulfide system. It was found during field checking of airborne electromagnetic anomalies that trace a graphitic schist unit below this barite occurrence (S.S. Dashevsky, written communication, 2003).The Drum unit that hosts the CC Barite occurrence consists of white to pale gray-green, rusty weathering, quartz-sericite(-chlorite-pyrite) schist with minor gray to black carbonaceous phyllite and rare interbeds of chloritic phyllite. The schist commonly contains 1 to 5 percent quartz eyes but may contain more. The protoliths of the schist are about two-thirds of volcanic origin and one-third of sedimentary origin. The schist has a phyllitic parting in many places.
|Geologic map unit||(-144.061147494264, 63.2134236437568)|
|Mineral deposit model||Kuroko massive sulfide (Cox and Singer, 1986; model 28a).|
|Mineral deposit model number||28a|
|Age of mineralization||The enclosing Drum unit has been dated at the Devonian-Mississippian boundary on the basis of one SHRIMP U-Pb zircon age of 359 +/- 6 Ma determined at the DD South prospect (MH325) (Dashevsky and others, 2003).|
|Workings or exploration||There has only been surface sampling and mapping at this occurrence (S.S. Dashevsky, written communication, 2003).|
|Indication of production||None|
Additional commentsUnpublished data cited is available for viewing by contacting Grayd Resources Inc. in Vancouver, B. C., Canada (www.grayd.com), or Northern Associates Inc. in Fairbanks, Alaska.
|Reporters||W.T. Ellis (Alaska Earth Sciences) and A.W. Wyatt and S.S. Dashevsky (Northern Associates Inc.)|
|Last report date||3/20/2003|